Skeletonized joist



'April 30, 1929. G. r'.-PAwLlNG sxELETONIzED JoIsT Original Filed July B, 1925 30 clalmed.

A'Patented'Api'. l I l l' i uNlTEn STATE-s PATENT OFFICE. Gnomi; r. rawrme. or rnrnmnnrnm, rrmrusirnvaim.V

Application led .Tuly` A8, 1925, Serial No. 42,118. ,Renewed JanuaryY 6, 1928.

The present invention stated in its broadskeletonized joist as clearly shown in Fig. est terms relates to building construction, 3 is of T.-shaped cross-section having a verarticularly ioor and ceiling structures, .and tical web 1 and a broad fiat top 2. In pracas more especial relation to skeletonized tice this top chord is planned to meet pre- 60 5 joist therefor. determined requirements. For example, The leading object of the present'invenwhen the contractor is erecting a building tion is to provide skeletonized joist which he has merely to designate to the manufacwhile cheaper and lighter than conventional turerof the joist ata central plant the dibar joist is possessed of great structural mensions between supporting girders and 66 1o strength, the approximatev weight to be sustained and A further object is to provide skeletonized properly proportioned skeletonized joist will joist which may be manufactured at a central be shipped to the contractor so that waste by plant in various sizes scientifically planned overlapping joist ends (as is now common to meet varied building requirements so that practice) is eliminated. The lower chord of 70 said dili`erent,predetermined sizes of joist the joist comprises ar pair of spaced bars may be shipped to the contractor ready for 3 4 of circular cross-section. The major erection without'waste of joist material as is portion of these bars 3 4 parallel the top now quite common practice in this art. chord and the respective ends of each bar Another object is to provide skeletonized are inclined as at 5 and are secured to the 75 joist provided at .the place of manufacture web of the top chord to support said inclined with pins or studs for the moreexpeditious ends. vThe remaining portion of the lower and uniform attachment of metal lath. chords are supported by means of vertical Other and further objects of the present struts or compression members 6. These invention reside in the provision of general struts are formed preferably as flat, web- 80 details of construction and arrangement and like pieces the width of which is substancombination of parts for attaining the retially equal to the width of the top 2 of the sults sought by the foregoing objects. V- T-shaped chord and they are each notched The invention consists of thenovel conat .their upper parts as at 7 see Fig. 4, to

structions hereinafter described and finally receive the web of the upper chord and are 85,

oppositely notched as at 8 8 to accommo- The nature, characteristic features and ydate the bars 3 4 of the lower chord. It is vscope of the invention will be -more fullyV apparent that the number of compression understood from the following description members- 6 employed depends upon the taken in connection with the accompanying length of the .upper chord and that therefore 90 drawings forming part hereof, and 1n the diagonally arranged tension members 9 which: may be increased or diminishedin number Fig. 1, is a view in a side elevation of accordingly. Where the tension members skeletonized joist embodying the inventionV -9 lie beneath the lower ends of the compres- F ig..2,` is a top or plan view thereof. sion members 6 they fit between the bars 95 40 Fig. 3, is aview in cross-section taken upon 3 4 the members 6 being notched as at 9aL the line 3 3 of Fig. 15 and to accommodate them, as clearly shown in Fig. 4, is a detail view'of one of the ver- Figs. 3 and 4. The struts 6 are welded to tical struts. the *upperV and lower chords; the inclined For the purpose of illustrating my invenends of the lower chord are welded to `the 100 tion I have shown in the accompanying'upper chord; the lower chord is Welded to. drawings one form thereof which is at the compression members; and the tension present preferred by me, since the same has members are. welded to the upper chord and been found in practice to give satisfactory to the compression members, all at the time and reliable results, although itisto be underof manufacture ata central plant. To the 105 "stood that the various instrumentalities of bottom edge of the web of the' upper chord which my invention consists can be variously `is welded, at each end of said chord, a plate arranged and organized and that my inven- 10 vadapted to rest upon girders as employed tion is not to be limited to the precise arragein floor and ceiling structures. Obviously, ment and organization of the instrumentalif the floor or ceiling-,is inclinedthese plates 1 1 ities as herein shown and described. will vary in shape to take care of the pitch E In the drawings athe upper chord of my contemplated. t the time of manufacture thereis welded upon the dat top of the 'upper chord a plurality of vertical pins, pegs, or studs 11, disclosed and claimed in a copending application Serial No. 13,355 filed- March 5, 1925, which pins or the like are Aadapted to puncture metallath, .not shown,

v joist now' employed andIv at the same time provide joist ready to accept and retain in secured position metal lath. Should it be necessary to leave an opening inthe floor for stairs, well, elevator, vent or the like the compression members 6 are apertured at 12 in the connection since supporting or other l structural parts may be bolted thereto, the

vto

per chord of chord composed of a pair of spaced bars, a

apertures 12 being used to accommodate the bolts. This is a very important feature not previously used in connection with skeletonized joist, steel joist, or bar-joist.

It will now be apparent that I have devised a novel and useful construction which embodies the features of advantage enumerated as vdesirable in the statement of the invention and the above description andl while I have in the present instance shown and described the preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it is be understood that the same is susceptible of modification in'various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages. 4 y

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A skeletonized joist comprising'an upper chord of T-shaped cross section a lower chord composed of a pair of s acedvbars, a series of flat compression mem ers between the chords, said members being notched at the top to embrace the stem of the T-shaped chord and at each chords'thelower portions of which t between said bars and extend under the compression members.

2. A skeletomzed joist 'comprising an up- T-shaped cross section, a lower series of flat compression members between the chords, the top to embrace the stem of the .T-shaped chord and at each bottom corner to embrace said bars, and tension members between the chords the lower portions of which :it be.

tween said bars and extend under 'their combottom corner to embrace said bars, and tension members between the said members being notched at pression members, said compression members being notched at a `point between'the bar notches to embrace said tension members.

3. A skeletonized joist comprising a T- shaped top chord, a bottom chord composed of a pair of bars bent upwardly at their ends to meet the topchord and spaced apart suiciently to embrace lthe stem of,v the T, and a compression member between said chords slotted at the top to embrace the stem of the T and secured at its lower corners to the bars of the bottom chord.

4. A skeletonized joist comprising a T- shaped top chord, a bottom chord composed of a pair of bars bent upwardly at their ends to; meet the top chord and spaced apart suffciently to embrace the stem of the T, a

compression member between -said chords slotted at the top to embrace the stem of the T and secured at its lower corners to the bars of the bottom chord, vand .a diagonal tension member between said chords secured above to the stem of the T and embraced below by the bars of thebottom chord at the base of said compressionl member,

5. A skeletonized joist comprising a T- shaped top chord, a bottom chord composed of a pair ofy bars bent upwardly at their ends to meet the top chord and spaced apart suficiently to embrace the stem of the T, and a compression member between said chords slotted at the top to embrace the stem of the T and notched at its lower corners to em-f brace the bars of the bottom chord and hold them in proper spaced position. v

6. A skeletonized jolst comprising 'a T- shaped top chord, a bottom chord composed of a pair-of bars bent upwardly at their'ends to meet the top chord y iciently toembrace the stem of. the T, a compression member between said chords slotted at the top lto meet the top chord and spaced a art suiciently toembrace the stemfof the a compression member lbetween said chords slotted at the top to embrace the stem of the T and notched'at its 'lower corners tol em`l .brace the bars of the bottom chord, anda diagonal tension member between chordsl bent upwardly at each side of center to meet the stem of the T and hav g its lower central ortion embraced by 'the bars of the bottom chord and lying beneath the end of said compression member. 8. A skeletonized -joist' comprising a T- to embrace the stem of the y T a d notched at its lower corners to em-` 'sufficiently to embrace the stem of the T, a

series of compression membersbetween said chords slotted 'at the topl to embrace the stem of the T and secured at their lower corners to the `bars of the bottom chord, and

diagonal /tenson members between said t chords each of lwhich is `,secured above tothe 10 stemnof the T adjacent an end of a compressio'n member and yembraced below by the bars of the bottom chord at vthe base of an A ad'acent` compression member.

n testimony whereof, I have hereunto 15 signed my name. c

GO. F. PAWLING. 

